TopToolAIElectricity Bill Calculator
ⓘ About this tool
🔄 Last updated 25 Sep 2026
✓ Reviewed by TopToolAI Team
Enter your monthly units consumed (kWh) and your utility's per-unit rate to see an estimated bill before it actually arrives.
How to use Electricity Bill Calculator
Step-by-step guide to the boxes below. Open it only if you need help.
How to use Electricity Bill Calculator
Step-by-step guide to the boxes below. Open it only if you need help.
-
1
Units consumed (kWh) Number
The units shown on your meter or last bill.
Example: 350
-
2
Rate per unit Number
The price per unit from your bill or tariff.
Example: 0.15
-
3
Fixed monthly charge Number
Any fixed charge that does not depend on use. Type 0 if none.
Example: 10
-
4
Press “Calculate”
Click the button under the boxes. If something is missing or not valid, a short message tells you which box to fix.
-
5
Read your result
You see your estimated electricity bill. Change any box and try again to compare different numbers.
Electricity Bill Calculator FAQs
Does this include taxes or surcharges?
No, it estimates the base energy charge only — add local taxes or fuel surcharges separately.
Why does my real bill differ slightly?
Utilities often use tiered/slab rates instead of one flat rate, which this simple version doesn't account for.
How is an electricity bill calculated?
Units consumed times the rate per unit, plus fixed charges, taxes and any adjustments.
What is a kWh?
A kilowatt-hour is the energy used by a 1,000-watt appliance running for an hour. Your meter and bill measure usage in kWh.
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